Application of transverse reference beams in holographic investigations of small particles

Pulsed holographic investigations of rapid processes established that Gabor-type (inverted-contrast) images were reconstructed from a double-beam hologram of small suspended particles. One of these images coincided with the real image corresponding to the double-beam arrangement and the other was observed in the conjugate ray and was characterized by a higher contrast than that usually obtained in Gabor (single-beam) holograms. The appearance of these images was attributed to the nonlinear response of the photographic hologram material.